我从数据库获取日期,我想将其转换为DateTime并将其设置为开始日期。我在下面写下:
Date fromDate = studentDateJoin.getDate();
//result: fromDate = Mon Jan 01 00:00:02 ICT 2018
//convert to DateTime
DateTime newDate = new DateTime(fromDate);
但是当我转换它时,在转换后添加时区。 newDate看起来像:
newDate = 2018-01-01T14:13:04.574Z+7
我有一个问题:如何将其转换为开始日期并删除时区:示例我想将其转换为:
//Convert it begin day and remove time zone
newDate = 2018-01-01T00:00:00.00;
如何将其转换为beginDay并删除时区:谢谢
更新:添加了Joda-Time版本,因为问题已从java-8
更改为jodatime
。
如果你有一个Joda-Time DateTime
,那么使用toLocalDate()
和toLocalDateTime(...)
:
DateTime dateTime = new DateTime(2018, 1, 1, 14, 13, 04, 574);
System.out.println(dateTime);
LocalDate localDate = dateTime.toLocalDate();
System.out.println(localDate);
LocalDateTime localDateTime = localDate.toLocalDateTime(LocalTime.MIDNIGHT);
System.out.println(localDateTime);
2018-01-01T14:13:04.574-05:00
2018-01-01
2018-01-01T00:00:00.000
如果你有“从数据库获取日期”,即java.sql.Date
,那么使用toLocalDate()
和atStartOfDay()
:
java.sql.Date sqlDate = new java.sql.Date(118, 0, 1);
System.out.println(sqlDate);
LocalDate localDate = sqlDate.toLocalDate();
System.out.println(localDate);
LocalDateTime localDateTime = localDate.atStartOfDay();
System.out.println(localDateTime);
2018-01-01
2018-01-01
2018-01-01T00:00
如果你有java.sql.Timestamp
,请使用toLocalDateTime()
和truncatedTo(...)
:
java.sql.Timestamp sqlTimestamp = new java.sql.Timestamp(118, 0, 1, 14, 13, 04, 574000000);
System.out.println(sqlTimestamp);
LocalDateTime localDateTime = sqlTimestamp.toLocalDateTime();
System.out.println(localDateTime);
localDateTime = localDateTime.truncatedTo(ChronoUnit.DAYS);
System.out.println(localDateTime);
2018-01-01 14:13:04.574
2018-01-01T14:13:04.574
2018-01-01T00:00
如果你有java.util.Date
,请使用toInstant()
,atZone(...)
,toLocalDate()
和atStartOfDay()
:
java.util.Date utilDate = new java.util.Date(118, 0, 1, 14, 13, 04);
System.out.println(utilDate);
Instant instant = utilDate.toInstant();
System.out.println(instant);
ZonedDateTime zonedDateTime = instant.atZone(ZoneId.systemDefault());
System.out.println(zonedDateTime);
LocalDateTime localDateTime = zonedDateTime.toLocalDate().atStartOfDay();
System.out.println(localDateTime);
Mon Jan 01 14:13:04 EST 2018
2018-01-01T19:13:04Z
2018-01-01T14:13:04-05:00[America/New_York]
2018-01-01T00:00